Table of Nuclides
Frequently Asked Questions
|2.1: Decay Data|
|Lr-257 and Se-82|
| I found there are two stange data in NUDAT database.
1) For Lr-257, the branch ratio for the spontaeneous fission appears to
Can I read it as <=0.0065 ?
2) For Se-82 2 beta decay the half life appears as
The Wallet gives 1.1E+20(+3-1) Y
However, the ENSDF entry gives 1.4E+20(0.4).
Which one is correct ?
|1. For 257Lr there should be no SF branch.
2. For 82Se (2b-) ENSDF value is 1.08E+20 Y +26-6 but in my revised wallet cards
I am going to quote 0.83E+20 Y 12. One of the problems with 2b- decay is
there is more than one value depending upon the decay mode is 2b-0nu or
2b-2nu (nu is neutrino), for my latest revision of Wallet Cards (in progress)
I have decided to give the lower limit.
- Jag Tuli -